CN112573604A - Hot water heating low-temperature multi-effect distillation seawater desalination device - Google Patents
Hot water heating low-temperature multi-effect distillation seawater desalination device Download PDFInfo
- Publication number
- CN112573604A CN112573604A CN202011428644.2A CN202011428644A CN112573604A CN 112573604 A CN112573604 A CN 112573604A CN 202011428644 A CN202011428644 A CN 202011428644A CN 112573604 A CN112573604 A CN 112573604A
- Authority
- CN
- China
- Prior art keywords
- hot water
- heat exchange
- effect
- exchange tube
- evaporator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to a hot water heating low-temperature multi-effect distillation seawater desalination device, and belongs to the technical field of seawater treatment. Comprises a low-temperature multi-effect evaporator; a unique heat exchange tube bundle structure is arranged in an evaporator shell of the first effect of the evaporator of the low-temperature multi-effect evaporator, and a spraying device is arranged above the heat exchange tube bundle. The invention adopts the design of the longitudinal channel in the heat exchange tube bundle, reduces the influence of secondary steam flow on the falling film liquid distribution, and ensures the normal and efficient heat transfer of hot water heating falling film evaporation; hot water directly enters the first-effect heat exchange pipe of the evaporator to serve as a heating heat source, so that the pressure loss of the hot water entering and exiting the low-temperature multi-effect distillation seawater desalination device can be reduced, a large-flow high-lift hot water return pump is not required to be configured, and the power consumption of seawater desalination for producing water is reduced; the invention does not need a hot water spraying system, the evaporator has no condensed water generation for the first time, the system is simple, and the maintenance is convenient; the invention does not need a hot water flash evaporation device, and reduces the equipment investment and the occupied area of the seawater desalination.
Description
Technical Field
The invention relates to a hot water heating low-temperature multi-effect distillation seawater desalination device, and belongs to the technical field of seawater desalination.
Background
Seawater desalination is an important open source approach of fresh water resources, can effectively relieve the contradiction between supply and demand of fresh water resources in coastal areas, and the necessity of fresh water supply to the ocean is also a necessary trend for solving the crisis of fresh water in coastal areas. In recent years, seawater desalination technology is adopted in high-energy-consumption industries such as large-scale steel, refining and the like in coastal areas to prepare fresh water so as to meet the water demand of the fresh water. Most of the industrial users have abundant low-temperature waste heat in the form of hot water with low cost, so the waste heat utilization combined with the low-temperature multi-effect distillation seawater desalination technology becomes the mainstream technology adopted by the industrial users, and the development direction of the new generation of hot seawater desalination technology is also provided.
The low-temperature multi-effect distillation seawater desalination technology has the basic principle that steam is condensed in a heat exchange pipe to release heat, seawater is sprayed outside the heat exchange pipe and uniformly distributed into a liquid film, part of absorbed heat is evaporated to generate secondary steam, the secondary steam enters a next-effect heat exchange pipe to serve as a heat source and is condensed into fresh water, and the process is repeated until the last effect is achieved. Wherein, the heating heat source in the first heat exchange tube is provided by an external heat source. The existing waste heat utilization and low-temperature multi-effect distillation seawater desalination technology generally adopts a hot water flash evaporation process, as shown in fig. 1, each effect of a low-temperature multi-effect evaporator 1 is provided with a heat exchange tube bundle two 12 with the same structure, the front end part of an evaporator first effect 2 is connected with a flash evaporation device 13, hot water under pressure is sprayed into the flash evaporation device 13 with certain vacuum degree through a hot water inlet tube 16, saturated steam corresponding to the vacuum degree is generated through flash evaporation and enters the heat exchange tube of the evaporator first effect 2 to serve as a heating heat source, the part of steam is condensed and then is independently led out from the evaporator first effect 2 to return into the flash evaporation device 13 through a condensate pump 14, and the condensed part of steam and the hot water which is not flashed are discharged out of the flash evaporation device 13 through.
The prior art has the following defects: 1) in order to ensure the flash evaporation efficiency, the volume of the flash evaporation device is required to be large and is usually larger than that of a single-effect evaporator, and the equipment investment and the occupied area are large; 2) in order to ensure the flash evaporation effect, a hot water spraying system is needed, and the first effect condensed water needs to be separately led out and returned to the flash evaporation device, so that the system complexity is high; 3) after entering the flash evaporation device, the hot water is released in pressure, and is discharged by using a large-flow high-lift water pump to boost pressure, so that the power consumption of seawater desalination for water production is increased.
Disclosure of Invention
The invention aims to solve the technical problems of complex design, large equipment investment, large land occupation and high power consumption for water production of the existing hot water flash evaporation low-temperature multi-effect distillation seawater desalination technology system.
In order to solve the problems, the technical scheme adopted by the invention is to provide a hot water heating low-temperature multi-effect distilled seawater desalination device, which comprises a low-temperature multi-effect evaporator; a heat exchange tube bundle is arranged in an evaporator shell of the first effect of the evaporator of the low-temperature multi-effect evaporator, and a spraying device is arranged above the heat exchange tube bundle.
Preferably, one end of the heat exchange tube bundle close to the hot water supply pipe is set as a front end, and one end of the heat exchange tube bundle far away from the hot water supply pipe is set as a rear end; the front end of the heat exchange tube bundle is provided with a front water chamber, and the rear end of the heat exchange tube bundle is provided with a rear water chamber; the bottom of preceding hydroecium is equipped with hot water import pipe, and the top of preceding hydroecium is equipped with hot water outlet pipe.
Preferably, a water outlet is arranged on the evaporator shell below the first-effect heat exchange tube bundle of the evaporator; the two sides of the heat exchange tube bundle are provided with guide plates, a steam channel is arranged between the guide plates and the evaporator shell, and a demisting device is arranged in the steam channel.
Preferably, the heat exchange tube bundle is provided with two or more than two double tube passes.
Preferably, a plurality of longitudinal channels perpendicular to the horizontal plane are arranged inside the heat exchange tube bundle.
Preferably, the spraying device comprises a spraying water inlet pipe and nozzles, the nozzles are arranged at unequal intervals, and an observation window and an inspection channel are arranged on the evaporator shell close to the spraying device.
Preferably, the demister is provided in a multi-layer arrangement.
Preferably, the demister is a wire mesh demister.
Compared with the prior art, the invention has the following beneficial effects:
the hot water heating low-temperature multi-effect distillation seawater desalination device provided by the invention has the advantage that the evaporator has a unique heat exchange tube bundle structure for the first effect. The heat exchange tube bundle is provided with a front water chamber, a rear water chamber, a hot water inlet pipe, a hot water outlet pipe and a plurality of double-tube passes, and hot water directly enters the heat exchange pipes to be used as a first-effect heating heat source of the evaporator; the heat exchange tube bundle is provided with a spraying device, a longitudinal channel is arranged in the tube bundle, corresponding steam channels are reserved on two sides of the tube bundle, and a guide plate and a wire mesh demister are arranged to separate liquid drops of secondary steam.
Compared with the prior art, the invention has the following advantages: 1) the design of a longitudinal channel in the heat exchange tube bundle can reduce the influence of secondary steam flow on falling film liquid distribution, and ensure the normal and efficient heat transfer of hot water heating falling film evaporation; 2) hot water directly enters the first-effect heat exchange pipe of the evaporator to be used as a heating heat source, so that the pressure loss of the hot water entering and exiting the low-temperature multi-effect distillation seawater desalination device can be greatly reduced, a large-flow high-lift hot water return pump is not required to be configured, and the power consumption of seawater desalination for producing water is reduced; 3) hot water directly enters the first-effect heat exchange tube of the evaporator to be used as a heating source, a hot water spraying system is not needed, no condensed water is generated in the first-effect of the evaporator, the system is simple, and the maintenance is convenient; 4) hot water directly enters the first-effect heat exchange tube of the evaporator to be used as a heating source, a hot water flash evaporation device is not needed, and the equipment investment and the occupied area of seawater desalination are reduced.
Drawings
FIG. 1 is a schematic diagram of a hot water flash evaporation low-temperature multi-effect distillation seawater desalination device in the prior art;
FIG. 2 is a schematic diagram of a hot water heating low-temperature multi-effect distillation seawater desalination device provided by the invention;
FIG. 3 is a front view of a first-effect heat exchange tube bundle structure of an evaporator of the hot-water heating low-temperature multi-effect distillation seawater desalination device provided by the embodiment;
FIG. 4 is a side view of a first-effect heat exchange tube bundle structure of an evaporator of a hot water heating low-temperature multi-effect distillation seawater desalination device provided by an embodiment.
FIG. 5 is a layout diagram of a first-effect heat exchange tube bundle of an evaporator of the hot-water heating low-temperature multi-effect distillation seawater desalination device according to the embodiment.
Reference numerals: 1. a low temperature multi-effect evaporator; 2. the evaporator is firstly effective; 3. a first heat exchange tube bundle; 4. a front water chamber; 5. a rear water chamber; 6. a hot water inlet pipe; 7. a hot water outlet pipe; 8. a spraying device; 9. a brine outlet; 10. a baffle; 11. a defogging device; 12. a second heat exchange tube bundle; 13 a flash evaporation device; 14. a condensate pump; 15. a hot water return pump; 16. a hot water inlet pipe; 17. a hot water return pipe; 18. cooling the seawater discharge port; 19. a seawater inlet; 20. product water; 21. and (4) strong brine.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:
as shown in fig. 1-5, the invention provides a hot water heating low-temperature multi-effect distillation seawater desalination device, which comprises a low-temperature multi-effect evaporator 1; a heat exchange tube bundle I3 is arranged in an evaporator shell of an evaporator first-effect 2 of the low-temperature multi-effect evaporator 1, and a spraying device 8 is arranged above the heat exchange tube bundle I3. One end of the first heat exchange tube bundle 3, which is close to the hot water supply pipe, is arranged as the front end, and the other end of the first heat exchange tube bundle, which is far away from the hot water supply pipe, is arranged as the rear end; the front end of the first heat exchange tube bundle is provided with a front water chamber 4, and the rear end of the first heat exchange tube bundle 3 is provided with a rear water chamber 5; the bottom of the front water chamber 4 is provided with a hot water inlet pipe 6, and the top of the front water chamber 4 is provided with a hot water outlet pipe 7. A brine outlet 9 is arranged on the evaporator shell below the heat exchange tube bundle I3 of the evaporator first effect 2; and flow guide plates 10 are arranged on two sides of the first heat exchange tube bundle 3, a steam channel is arranged between the flow guide plates 10 and the evaporator shell, and a demisting device 11 is arranged in the steam channel. The heat exchange tube bundle 3 is set to be a double tube pass with two or more passes. A plurality of longitudinal channels vertical to the horizontal plane are arranged inside the heat exchange tube bundle I3. The spraying device 8 comprises a spraying water inlet pipe and nozzles, the nozzles are arranged at unequal intervals, and an observation window and an overhaul channel are arranged on an evaporator shell close to the spraying device. The defogging devices 11 are provided in a multi-layered arrangement. The defogging device is set as a wire mesh defogger.
As shown in fig. 2-5, it is a schematic diagram of a hot water heating low-temperature multi-effect distillation seawater desalination device and a schematic diagram of a first-effect heat exchange tube bundle of an evaporator. The hot water heating low-temperature multi-effect distillation seawater desalination device comprises a low-temperature multi-effect evaporator 1, wherein the first effect 2 of the evaporator is provided with a heat exchange tube bundle I3 with a structure different from that of other effects. The front end of the heat exchange tube bundle I3 is provided with a front water chamber 4, and the rear end of the heat exchange tube bundle I3 is provided with a rear water chamber 5; a hot water inlet pipe 6 is arranged at the bottom of the front water chamber 4, and a hot water outlet pipe 7 is arranged at the top of the front water chamber; the tube pass of heat exchange tube bank 3 is arranged according to the four-pass, and the hot water under pressure loops through hot water inlet pipe 16 and hot water inlet pipe 6 and enters the evaporator for the first effect 2, and the hot water flows through four tube passes from bottom to top in turn and then flows out of the evaporator for the first effect 2 from hot water outlet pipe 7 and hot water return pipe 17, and directly returns to the outside of the seawater desalination device. A spraying device 8 is arranged above the heat exchange tube bundle I3, the spraying device 8 comprises a spraying water inlet pipe and nozzles, the nozzles are arranged at unequal intervals, and seawater is sprayed onto the heat exchange tubes from the spraying device 8 and uniformly distributed to form liquid films; four longitudinal channels are arranged inside the first heat exchange tube bundle 3, so that the influence of secondary steam flow generated by evaporation on a liquid film is reduced. And a brine outlet 9 is arranged on the evaporator shell below the heat exchange tube bundle I3. Two sides of the first heat exchange tube bundle 3 are provided with guide plates 10, a steam channel is formed between the guide plates 10 and the shell, and two layers of demisting devices 11 are arranged in the steam channel; the defogging device 11 adopts a silk screen; the demisting device 11 is used to remove the brine droplets carried with the secondary steam. Seawater enters the hot water heating low-temperature multi-effect distilled seawater desalination device from a seawater inlet 19, the treated product water 20 and the concentrated brine 21 are respectively discharged from the desalination device, and the treated seawater is discharged from a cooled seawater discharge outlet 18.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (8)
1. A hot water heating low-temperature multi-effect distillation seawater desalination device comprises a low-temperature multi-effect evaporator; the method is characterized in that: a heat exchange tube bundle is arranged in an evaporator shell of the first effect of the evaporator of the low-temperature multi-effect evaporator, and a spraying device is arranged above the heat exchange tube bundle.
2. The hot water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 1, characterized in that: one end of the heat exchange tube bundle, which is close to the hot water supply pipe, is set as a front end, and one end of the heat exchange tube bundle, which is far away from the hot water supply pipe, is set as a rear end; the front end of the heat exchange tube bundle is provided with a front water chamber, and the rear end of the heat exchange tube bundle is provided with a rear water chamber; the bottom of preceding hydroecium is equipped with hot water import pipe, and the top of preceding hydroecium is equipped with hot water outlet pipe.
3. The hot water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 2, characterized in that: a water outlet is formed in the evaporator shell below the first-effect heat exchange tube bundle of the evaporator; the two sides of the heat exchange tube bundle are provided with guide plates, a steam channel is arranged between the guide plates and the evaporator shell, and a demisting device is arranged in the steam channel.
4. The hot-water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 3, characterized in that: the heat exchange tube bundle is provided with two or more than two double tube passes.
5. The hot-water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 4, wherein: and a plurality of longitudinal channels vertical to the horizontal plane are arranged in the heat exchange tube bundle.
6. The hot-water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 5, characterized in that: the spraying device comprises a spraying water inlet pipe and a nozzle, the nozzle is arranged at unequal intervals, and an observation window and an overhaul channel are arranged on an evaporator shell close to the spraying device.
7. The hot-water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 6, characterized in that: the defogging device is provided in a multi-layer arrangement.
8. The hot-water heating low-temperature multi-effect distillation seawater desalination device as claimed in claim 7, characterized in that: and the defogging device is a wire mesh defogger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011428644.2A CN112573604A (en) | 2020-12-09 | 2020-12-09 | Hot water heating low-temperature multi-effect distillation seawater desalination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011428644.2A CN112573604A (en) | 2020-12-09 | 2020-12-09 | Hot water heating low-temperature multi-effect distillation seawater desalination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112573604A true CN112573604A (en) | 2021-03-30 |
Family
ID=75130345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011428644.2A Pending CN112573604A (en) | 2020-12-09 | 2020-12-09 | Hot water heating low-temperature multi-effect distillation seawater desalination device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112573604A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804266A (en) * | 2022-05-18 | 2022-07-29 | 天津国投津能发电有限公司 | Falling film condenser of low-temperature multi-effect distillation seawater desalination system |
-
2020
- 2020-12-09 CN CN202011428644.2A patent/CN112573604A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804266A (en) * | 2022-05-18 | 2022-07-29 | 天津国投津能发电有限公司 | Falling film condenser of low-temperature multi-effect distillation seawater desalination system |
| CN114804266B (en) * | 2022-05-18 | 2023-02-28 | 天津国投津能发电有限公司 | Falling film condenser of low-temperature multi-effect distillation seawater desalination system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1323032C (en) | Apparatus of combined solar energy heat pump for desaltination of sea water | |
| CN108147608B (en) | Multi-effect evaporation crystallization system and method for treating power plant brine wastewater by using compressed air and heat pump | |
| CN102765770B (en) | Efficient machine for desalting sea water | |
| CN103553166A (en) | Device and method of treating wastewater with high salt content by utilizing waste heat of circulating water | |
| CN101786677B (en) | Multiple-effect horizontal tube falling film evaporation sea water desalinating device with horizontally arranged tube bundle | |
| CN101704539A (en) | Method and device for evaporating mother liquid in aluminium oxide plant | |
| CN204151180U (en) | A kind of efficient mechanical vapor recompression sea water desalinating plant | |
| CN112573604A (en) | Hot water heating low-temperature multi-effect distillation seawater desalination device | |
| CN103342397B (en) | Energy-saving low-temperature multi-effect distillation sea water desalination method | |
| CN105110400B (en) | The therrmodynamic system of waste steam latent heat of turbine comprehensive utilization | |
| CN215756536U (en) | Hot water heating low-temperature multi-effect distillation seawater desalination device | |
| CN104310514A (en) | Efficient mechanical vapor recompression seawater desalination method | |
| CN103453605B (en) | The power plant vaporation-type condensing plant of indirectly-direct combination | |
| CN203478483U (en) | Composite evaporating and condensing device suitable for power plant | |
| CN106186497B (en) | Purified water, distilled water and pure steam all-in-one machine | |
| CN101885550A (en) | Multiple-effect horizontal pipe falling film evaporation sea water desalting plant with middle vapor-liquid separation | |
| CN203558881U (en) | Forward overlaid horizontal falling film multi-effect evaporation sea water desalination device | |
| CN100404798C (en) | Energy-saving vapour-exhausting device with built-in heat exchanger | |
| CN213231584U (en) | Desulfurization waste water high temperature flash distillation processing apparatus | |
| CN212227822U (en) | External connection straight-through type phase change heat exchange device | |
| CN103086451A (en) | Multi-effect evaporative sea water desalinating device with hybrid process | |
| CN104096370B (en) | Multistage evaporating column used for carrying out evaporation process to salt-containing water through air | |
| CN202988780U (en) | Vapor compression evaporating device | |
| CN207012583U (en) | Falling film evaporation system and its vacuum plant | |
| CN104864733A (en) | Tower top shell tube type condenser of ammonia distilling tower |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |